Tear bar devices in business machines



: Oct. 8, 1957 A, FROBEL TEAR BAR DEVICES IN BUSINESS MACHINES FiledMarch so, 1954 4 SEeets-Sheet l IN V EN TOR.

Filed March 50, 1954 Oct. 8, 1957 Q L 2,808,919

TBAR BAR DEVICES IN BUSINESS MACHINES 4 Sheets-Sheet 2 r I I F/& 25.

INVENTOR. @KJ;

BY "n I Oct. 8, 1957 A. FRGBEL TEAR BAR DEVICES INBUSINESS MAGHINESFiled March 30, 1954 4 wn s I izvmvrmig Oct. 8, 1957 FRUBEL 2,808,919

TEAR BAR DEVICES IN BUSINESS MACHINES Filed March 30, 1954 4Sheets-Sheet 4 IN V EN TOR. h

United States Patent TEAR EAR DEVICES IN BUSINESS MACHINES ArthurFriibel, Oherndorf (Neckar), Germany, assignor to Blympia WerkeAktieng'esellschaft, Wilhelmshaven, Germany Application March 30, 1954,Serial N 0. 419,820 Claims priority, application Germany March 31, 195314 Claims. (Cl. 197-133) The present invention relates to businessmachines of all types, such as calculating machines and other oificemachines which include a turnable platen and structure for locating theplaten in predetermined angular positions at which lines of informationare either printed or typed on a sheet of paper by the machine and whichfurther include a member against which the paper is torn.

With machines of this type an extremely disturbing noise is made whenthe paper is pulled so as to rotate the platen due to the engagementbetween a roller memher or the like and the ratchet wheel which rotatestogether with the platen. This noise can be eliminated if the operatortakes the trouble to disengage the pressure rolls from the platen or toseparate the above-mentioned roller member from the ratchet wheel, butsuch an operation usually takes up too much time for the operator tobother with it.

it is accordingly an object of the present invention to overcome theabove drawbacks by providing a means for eliminating the disturbingnoise produced by the rotating platen when the paper is pulled.

A further object or" the present invention is to eliminate this noise ina fully automatic manner requiring the operator only to pull the paperin the usual manner.

Another object of the present invention is to make the paper much easierto pull while at the same time accomplishing the above objects ofautomatically eliminating the disturbing noise. a

An additional object of the present invention is to provide a means forremovably mounting a tearing member, against which the paper is torn bythe operator, on a calculating machine and in such a way that the noiseproduced with conventional machines when the paper is pulled iseliminated when with the machine of the invention the paper is pulledagainst the tearing member.

With the above objects in View the present invention mainly consists ofa business machine which includes a support means on which a platenmeans is mounted for rotation about its axis. A pressure structure, forpressing sheet material against the platen means, is mounted on thesupport means for movement between an operative position in engagementwith the platen means and an inoperative position out of engagement withthe platen means. A locating structure, for locating the platen means ina given angular position, is mounted on the support means for movementbetween an operative position in engagement with the platen means and aninoperative position out of engagement with the platen means. A tearingmember is located next to the platen means and the operator tears thesheet material against this tearing member, the latter being mounted onthe support means for movement in a predetermined direction when thesheet material is pulled and engages the tearing member. A motiontransmitting means extends between the tearing member and at least oneof the pressure and locating structures for automatically moving thisone. structu e tram its operative into its inoperative position when thetearing. member moves in the abovementioned predetermined direction.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings, inwhich:

Fig. 1 is a perspective view of one possible machine constructed inaccordance with the present invention;

Fig. 2 is a schematic side view of one embodiment of the presentinvention;

Fig. 2a is a side view of a machine having the construction shown inFig. 2 and showing the side walls of the machine;

Fig. 2b is a fragmentary top plan view of the structure shown in Fig.2a;

Fig. 2c is a View of the structure shown in Fig. 2a with one of the sidewalls removed;

Fig. 2d is a sectional view of the structure of Figs. 22c, Fig. 2d beingtaken along a vertical plane which passes transversely through theplaten to the rear of the machine;

Fig. 3 is a fragmentary side elevational view of a second embodiment ofthe present invention; and

Fig. 4 is a fragmentary side elevational view of a third embodiment ofthe present invention.

As is shown in Fig. 1, the invention is illustrated in the drawings asapplied to an adding machine, although it is to be understood that theinvention is applicable to all types of business machines, as will beevident from the description which follows. As is shown in Figs. 2a and2b, the platen 1 of the machine is turnably carried at each end of themachine by the side walls 2 and 3 which are located in spaced relationto each other at each side of the machine. A tearing member 4 is locatednext to the platen 1 and extends parallel thereto, this tearing member 4being in the form of an elongated rail which is serrated along one ofits side edges. Each end of the tearing rail 4 is fixed to a side arm 5which is turnably carried in the tubular bearing member 2a which isfixed to each side wall 2, as is evident from Figs. 2 and 2b. The arms 5are carried in the bearing members 2:; through the medium of pivot pins5a fixed to each arm 5 and extending respectively into the tubularbearing members 2a. Each pivot pin 5a is formed with a pair of oppositeflats, as is particularly evident from Fig. 2, and each bearing member2a is formed in an upper portion thereof with a cutout 21) extendinginwardly from its free end, distant from the side wall 2, by a distanceat least equal to the length of the pivot pin 5a. Each of these cutouts227 has a width corresponding to the distance between the flats of eachpivot pin 55:. Thus, when the tearing member 4 and the arms 5 are turnedslightly beyond the uppermost dot-dash line position shown in Fig. 2,the flats of the pivot pins 5a, which are aligned with each other, arelocated next to the edges of the cutout 2b of each bearing member 2a sothat when 1e tearing member 4 is beyond the uppermost position shown inFig. 2, the entire tearing member with the arms 5 and pivot pins 5a maybe removed from the bearings 2a, and of course, the tearing member 4with the arms 5 and pivot pins 5Z1 may be replaced through the reverseof the above operations. I v

A length of sheet material is guided in a conventional manner over theplaten 1, and in the particular example illustrated a strip of sheetmaterial 6a is shown as being drawn from a roll 6 and guided over theplaten 1. As is evident from Figs. 2a and 2b, the roll 6 is turnablycarried by a shaft 7 which is itself carried at each of its ends in aPatented Oct. 8, 1957 lever 8 which is turnably carried by each pair ofside walls 2 and 3 through the medium of a pin 9 fixed to each pair ofwalls 2 and 3 and turnably carrying the lever S. Beneath the platen 1there are located, as is conventional, the pressure rollers 10 and 11(Fig. 2) at each end of the platen 1, and the rollers 10 are carried bya pair of levers 12, respectively, one of which is shown most clearly inFig. 2d, while the pressure rollers 11 are carried by the levers 13 oneof which is shown in Fig. 2a. Each pair of levers 12 and 13 are mountedfor turning movement about a common shaft 14 which is fixed to thesupporting structure of the machine and extends parallel to theplaten 1. The free ends of levers 12 and 13 are drawn toward each otherby a spring 15, as shown in Fig. 2d, so that in this way the spring 15simultaneously urges the pressure rollers 19 and 11, at each end of themachine, against the platen 1. A shaft 16 is turnably carried by thesupporting structure of the machine (Fig; 2d) and also extends parallelto the platen 1, this shaft 16 having fixed thereto between the freeends of each pair of levers 12 and 13 a cam 17 which is provided with apair of opposite camming portions 17a and 17b. On the right side of themachine (Figs. 1 and 2d) there is located a manually operable arm 18which is also fixed to the shaft 16. When the operator engages the topend of arm 18 and moves it forwardly, then the shaft 16 and earns 17turn in a counterclockwise direction, as viewed in Fig. 2d, so that thecamming portion 17a bears against the projection 12a of lever 12 whilethe camming portion 17b bears against the projection 13a of the lever 13so that the lever 12 is turned about shaft 14 in a counterclockwisedirection while the lever 13 is turned about shaft 14 simultaneously ina clockwise directiomand in this way the pressure rolls 10 and 11 aremoved away from the platen 1.

Next to an end of the platen 1 there is located a ratchet wheel 1% whichis coaxial with the platen and fixed thereto for rotation therewith,this ratchet wheel 19 serving to locate the platen in predeterminedangular positions as well as to turn the latter through predeterminedangles through the medium of a pawl which is moved into engagement withthe ratchet wheel 19 only when the platen 1 is to be turned between thelines which are printed or typed on the strip 6a. At all other timesthis pawl is out of engagement with the ratchet wheel 19. This pawlstructure for engaging the ratchet wheel 19 to turn the platen 1 througha predetermined angle forms no part of the present invention and mayhave the construction shown in Fig. 6 of U. S. Patent No. 2,114,604. Thestructure for locating the platen means 1, 9 in any one of a number ofpredetermined angular positions after the platen 1 has been turnedthrough the line spacing structure takes the form of a roller 23 whichis turnably carried by a lever 20 and which bears between a pair of theteeth of ratchet wheel 19 when the platen 1 is stationary. The lever 20which turnably carries the roller 23 is mounted for turning movementabout a shaft 21 which is parallel to platen 1 and which is carried bythe supporting structure of the machine. A spring 22 engages the lever20 to urge the roller 23 into engagement with the teeth of the ratchetwheel 19.

When the operator wishes to move the strip 6a to a position where it isconvenient to tear this strip away from the machine, the operator pullsthe strip 6a against and past the tearing member 4 which is raised inthis Way to the dotted line position shown in Fig. 2 just above thesolid line position of the tearing member 4. The arms 5 of course movewith the tearing member 4 at this time. As is evident particularly fromFigs. 2 and 2b, the arm 5 shown in these figures is connected to one endof the pivot pin 5a shown therein, while thelopposite end of the pivotpin 5a, which extends through the bearing 2a and an opening in the wall2, has fixed thereto a lever 5b located between the-walls 2 and .3 andalso located in the same plane as the lever 20, so that when the tearingmember.4. is raised'upwardlyby pulling-er the strip 6a, as

a 4 shown in Fig. 2, the lever 5b necessarily turns in a clockwisedirection, as viewed in Fig. 2.

This lever 51') includes a projection 50 which is fixed to one end of aspring 24 the opposite end of which engages the shaft 21 so that thisspring 24 lightly urges the tearing member 4 to the solid line positionshown in Fig. 2. The lever arm 512 further includes a pair of cammingfaces 5d and 5e which are inclined to each other. Opposite these cammingfaces is located a projection 20a of lever 29 which forms a cam tocooperate with the camming faces of the lever or cam 5b. This camprojection 20a of lever 20 also has a pair of inclined camming faces.When the tearing member 4 is raised to the dotted line position shown inFig. 2 by pulling of the strip 6a, the cam 5b turns in a clockwisedirection and its camming face 5d first engages the cam 200: at itsright hand camming face, as viewed in Fig. 2, to turn the lever 20against the action of the spring 22 in a counterclockwise directionabout shaft 21 away from the platen 1 so as to move the roller 23 out ofengagement with the ratchet Wheel 19. Then the camming face 5e of cam51') engages the left camming face of cam portion 20:: of roller 20, andthese camming faces bear against each other in such a Way that thespring 22, which is stronger than the spring 24, holds the tearingmember 4 in the dotted line position shown in Fig. 2, so that the roller23 is maintained in the dotted line position of Fig. 2 away from theratchet Wheel 19. Thus, when the strip 6a is pulled against the tearingmember 4 preparatory to pulling the strip 6a along the platen 1 fortearing off alength of the strip 6a, the tearing member 4 is turned tothe dotted line position shown in Fig. 2 and maintained in thisposition, after which the strip 6a is pulled through the length desiredto be torn, and during this time the roller 23 does not engage theratchet wheel 19 so that the disturbing noise is eliminated in acompletely automatic manner with the apparatus of the invention. Thenthe strip is torn along the serrated edge of the tearing member 4, andthe latter is returned to the solid line position shown in Fig. 2. Sincethe camming face 5e cooperates with the uppermost camming edge of camportion 20a to maintain the lever 20 in the dotted line position shownin Fig. 2, the tearing member 4 may simultaneously serve as a. lever formoving the roller 23 out of engagement with the ratchet 19 when it isdesired to originally pass'the strip 6a about the platen 1.

A stop 25 is provided, as shown in Figs. 1 and 2, to prevent turning ofthe arms 5 beyond the dot-dash line position shown in Fig. 2 until thestop 25 is removed from the machine, so that the member 4 and the partsconnected thereto cannot be removed from the bearings 2a until the stop25 is removed. This stop 25 advantageously forms part of the left covermember 26 (Fig. l) which surrounds the left end of the platen 1, so thatwhen this cover member 26 is removed in any known way as by being movedto the left, as viewed in Fig. l, the member 4, arms 5 and pivot pins 5atogether with cam 5b may be removed from the machine, spring 24 beingdisconnected from extension 50 of cam SI: for this purpose. When thearms 5 are in the dot-dash line position shown in Fig. 2, the extension50 is located above the turning axis of the arms 5 so that the spring 24moves beyond its dead center position and urges the arms 5 toward thestop 25. Otherwise, that is, when the cover 26 is located in theposition shown in Fig. 1, the stop portion 25 of cover 26 prevents thearms 5 from being turned beyond the uppermost dot-dash line positionshown in Fig. 2, so that the tearing member 4 cannot be removed from themachine.

It will be noted from Fig. 2 that when the arms 5 are turned upwardlybeyond the dotted line position in Fig. 2 to the dot-dash line position,the cam 5b moves beyond the cam 20a to again release the lever 20 to theinfluence of spring 22 so that the roller 23 then moves again intoengagement with the ratchet wheel 19, so that the lines on the strip 6amay be adjusted with respect to the lines at which the roller 23 locatesthe platen 1 in cooperation with the ratchet wheel 19, while the arms 5are thus raised, the left arm 5, as viewed in Fig. 1, resting againstthe stop 25 in this position of the apparatus. Of course, lever 18 isactuated to move rollers and 11 away from platen 1 when the paper is tobe adjusted. Fig. 2c shows the above described structure with the sidewall 3 removed, so that the structure between the walls 2 and 3 isclearly illustrated in Fig. 20.

Fig. 3' shows a second embodiment of the invention which renders thestrip 611 easier to move by automatically moving one of the pressurerollers at each end of the platen away from the latter simultaneouslywith movement of the roller 23 away from the ratchet wheel 19, theparticular example in Fig. 3 being capable of moving the pressurerollers 11 away from the platen 1 simultaneously with the movement ofroller 23 away from ratchet wheel 19 so that with the embodiment of Fig.3 only the pressure rollers 10 press the strip against platen 1 when thetearing member 4 is raised. All of the above described structure isincluded in Fig. 3, but in addition a link 27 is pivotally connected at51 to the cam 5b, and this link has a slotted lower end portion locatedabout a pin 13b fixed to the lever 13. A pair of these levers 27 arepivotally connected to the pair of arms 5, respectively, and theselevers 2'7 engage the pair of levers 13, respectively, in the mannershown in Fig. 3. Thus, as is evident from Fig. 3, When the arms 5 areturned upwardly, the levers 27 move downwardly and move the pins 13bdownwardly to simultaneously move the levers 13 in a clockwise directionabout shaft 14 so as to turn the rollers 11 away from the platen 1. Itwill be noted that the slotted lower end portions of links 27 enable thelevers 13 to be turned by the cams 17 in the manner described above. itshould be noted that while a pair of the links or levers 27 are providedto cooperate with the pair of levers 13, respectively, only one cam 5bis provided since there is only one lever and only one roller 23. Withthe embodiment of Fig. 3 the paper will be properly guided by thecooperation between the pressure rollers 10 and platen 1 even whenroller 23 is out of engagement with ratchet wheel 19 and pressurerollers 11 are turned away from the platen 1, so that with theembodiment of Fig. 3 the objectionable noise is eliminated and at thesame time the paper is easily drawn around the axis of platen 1 andproperly guided by the pressure rollers 11).

Fig. 4 shows a further embodiment of the invention according to which anarm 5 does not transmit its movement to the lever 20 so that with theembodiment of Fig. 4 the roller 23 always remains in engagement with theratchet wheel 19. According to the embodiment of Fig. 4, instead ofmoving the roller 23 away from the ratchet wheel 19, the pressurerollers 16 and 11 are simultaneously moved away from the platen 1 sothat with the embodiment of Fig. 4 the platen 1 remains stationary whilethe strip 6a is pulled around the same to eliminate the noise in thismanner. As is shown in Fig. 4, one of the arms 5 has pivotally connectedthereto a link 28 which is pivotally connected to this arm 5 at 5g, thelower end of link 28 being pivotally connected to the free end of lever29 which is fixed to the shaft 16 which carries the pair of cams 17,described above, for simultaneously turning the pressure rollers 10 and11 away from the platen 1. Thus, with the embodiment of Fig. 4, when thetearing member 4 is raised to turn the arms 5 in a clockwise direction,as viewed in Fig. 4, the link 28 moves downwardly to turn the lever 29and the shaft 16 and cams 17 therewith in a counterclockwise direction,as viewed in Fig. 4, so that the pressure rollers 10 and 11 aresimultaneously moved out of engagement with the platen 1 when thetearing member 4 is moved upwardly in the manner described above. Onlyone link 28 and lever 29 is required at one side of the platen 1 sincethe turning of the shaft 15 turns 6 both the cams 17 to actuate thelevers 12 and 13a both ends of the machine.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofbusiness machines differing from the types described above.

While the invention has been illustrated and described as embodied inmeans for eliminating noise from business machines, it is not intendedto be limited to the details shown, since various modifications andstructural changes may be made without departing in any way from thespirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialchafacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In a business machine in combination, support means; platen meansmounted for rotation about its axis on said supportmeans; a pressurestructure, for pressing sheet material against said platen means,mounted on said support means for movement between an operative positionin engagement with said platen means and an inoperative position out ofengagement with said platen means, said pressure structure constitutingthe sole means in the machine for pressing sheet material against saidplaten means; a locating structure, for locating said platen means inany one of a plurality of predetermined angular positions about itsaxis, mounted on said support means for movement between an operativeposition in engagement with said platen means and an inoperativeposition out of en'- gagement with said platen means; a tearing memberlocated next to said platen means and against which the sheet materialis torn by the operator, said tearing member being mounted on saidsupport means for movement in a predetermined direction away from saidplaten means when the sheet material is pulled against said tearingmember with a force sufficient to move it away from said platen means;and motion transmitting means extending between said tearing member andat least one of said structures for automatically moving the latter fromsaid operative into said inoperative position thereof when said tearing'member moves in said predetermined direction.

2. In a business machine, in combination, support means; platen meansmounted for rotation about its axis on said support means; a pressurestructure, for pressing sheet material against said platen means,mounted on said support means for movement between an operative positionin engagement with said platen means and an inoperative position out ofengagement with said plate'n means; a locating structure, for locatingsaid platen means in any one of a number of predetermined angular positions about its axis, mounted on said support means for movement betweenan operative position in engagement with said platen means and aninoperative position out of engagement with said platen means; a tearingmember located next to said platen means and against which the sheetmaterial is torn by the operator, said tearing member being mounted onsaid support means for movement in a predetermined direction away fromsaid platen means when the sheet material is pulled against said tearingmember with aforce sufiicient to move it away from said platen means;and motion transmitting means extending between said tearing member andsaid locating structure for automatically moving the latter from saidoperative into said inoperative position thereof when said tearingmember moves in said predetermined direction.

3. In 'a business machine, in combination, support means; platen meansmounted for rotation about its axis on said support means; a pressurestructure, for pressing sheet material against said platen means,mounted on said support means for movement between an operative positionin engagement with said platen means and an inoperative position out ofengagement with said platen means, said pressure structure constitutingthe sole means in the machine for pressing sheet material against saidplaten means; a locating structure, for locating said platen means inanyone of the number of predetermined angular positions, mounted on saidsupport means for movement between and operative positions about itsaxis in engagement with said platen means and an inoperative positionout of engagement with said platen means; a tearing member located nextto said platen means and against which the sheet material is torn by theoperator, said tearing member being mounted on said support means formovement in a predetermined direction away from said platen means whenthe sheet material is pulled against said tearing member with a forcesuflicient to move it away from said platen means; and motiontransmitting means extending between said tearing member and saidpressure structure for automatically moving the latter from saidoperative into said inoperative position thereof when said tearingmember moves in said predetermined direction.

4. In a business machine, in combination, support means; platen meansmounted for rotation about its axis on said support means; a pressurestructure, for pressing sheet material against said platen means,including a pair of pressure rollers adjacent each end of said platenmeans mounted on said support means for movement between an operativeposition in engagement with said platen means and an inoperativeposition out of engagement with said platen means; a locating structurefor locating said platen means in any one of a number of predeterminedangular positions about its axis, mounted on said support means formovement between an operative position in engagement with said platenmeans and aninoperative position out of engagement with said platenmeans; a tearing member located next to said platen means and againstwhich the sheet material is torn by the operator, said tearing memberbeing mounted on said support means for movement in a predetermineddirection away from said platen means when the sheet material is pulledagainst said tearing member with a force sufiicient to move it away fromsaid platen means; and motion transmitting means extending between saidtearing member and said locating structure and one-of said rollersadjacent each end of said platen means for automatically moving saidlocating structure and the latter rollers from said operative into saidinoperative position thereof when said tearing member moves in saidpredetermined direction. 7 5. In a business machine, in combination,support means; platen means mounted for rotation about its axis on saidsupport means; a pressure structure, for pressing sheet material againstsaid platen means, mounted on said support means for movement between anoperative position in engagement with said platen means and aninoperative position out of engagement with said platen means, alocating structure, for locating said platen means in any one of anumber of predetermined angular positions about its axis, mounted onsaid support means for movement between an operative position inengagement with said platen means and an inoperative position out ofengagement with said platen means; a tearing member located next to saidplaten means and against which the sheet material is torn by theoperator, said tearing member being mounted on said support means formovement in a predetermined direction away from said platen means whenthe sheet material is pulled against said tearing member with a forcesutficient to move it away from said platen means; motion transmittingmeans extending between said tearing member and said locating structurefor automatically moving the latter from said operative into saidinoperative position thereof when said tearing member moves in saidpredetermined direction; and manually operable moving means operativelyconnected to said pressure structure for moving the latter from saidoperative to said inoperative position thereof.

6. In a business machine, in combination, support means; platen meansmounted for rotation about its axis on said support means; a pressurestructure, for pressing sheet material against said platen means,mounted on said support means for movement between an operative positionin engagement with said platen means and an inoperative position out ofengagement with said platen means; a locating structure, for locatingsaid platen means in any one of a plurality of predetermined angularpositions about its axis, mounted on said support means for movementbetween an operative position in engagement with said platen means andan inoperative position out of engagement with said platen means; atearing member located next to said platen means and against which thesheet material is torn by the operator, said tearing member beingremovably connected to said support means and mounted on said supportmeans for movement in a predetermined direction away from said platenmeans when the sheet material is pulled against said tearing member witha force suflicient to move it away from said platen means; and motiontransmitting means extending between said tearing member and at leastone of said structures for automatically moving the latter from saidoperative into said inoperative position thereof when said tearingmember moves in said predetermined direction.

7. In a business machine as defined in claim 6, said tearing memberbeing in the form of an elongated rail extending parallel to said platenmeans; a pair of arms respectively fixed to opposite ends of said railand extending rearwardly therefrom; a pair of pivot pins fixedrespectively to end portions of said arms distant from said rail, saidpivot pins being aligned with each other and each having opposed flats,the flats of one pivot pin being respectively aligned with the flats ofthe other pivot pin; and a pair of tubular bearing members fixed to saidsupport means and respectively surrounding said pivot pins to supportthe latter and said arms for turning movement about a predeterminedaxis, each of said bearing members having a free end and being formed inan upper portion with a cutout extending inwardly from said free endthereof at least to the same extent that the pivot pin in said bearingmember extends into the same, said cutouts also being aligned with eachother and having a width at least as large as the distance between theflats of each pivot pin, so that said pins may be inserted into andremoved from said tubular bearing members through said cutouts thereof,respectively.

8. In a business machine as defined in claim 7, a stop member removablyfixed to said support means and engaging at least one of said armsbefore said tearing member reaches a position where said pivot pins canbe removed from said bearing members so that said tearing member andsaid arms and pivot pins therewith cannot be removed from the machinewhile said stop member is fixed to said support means.

9. In a business machine as defined in claim 2, said platen meansincluding a platen and a ratchet wheel fixed thereto for turningmovement therewith, said locating structure including a bar turnablycarried by said support means, a roller turnably carried by said bar andlocated opposite the teeth of said ratchet wheel, and a spring connectedto said bar for urging said roller into engagement with said teeth; anarm carrying said tearing member and being turnably mounted on saidsupport means; and a cam forming part of said motion transmitting means,being fixed to said arm, and extending toward and located adjacent tosaid bar for engaging the latter during movement ofsaid tearing memberin said predetermined direction to turn said bar and said rollertherewith against the action of said spring away from said ratchetwheel.

10. In a business machine as defined in claim 2, said platen meansincluding a platen and a ratchet wheel fixed thereto for turningmovement therewith, said locating structure including a bar turnablycarried by said support means, a roller turnably carried by said bar andlocated opposite the teeth of said ratchet wheel, and a spring connectedto said bar for urging said roller into engagement with said teeth; anarm carrying said tearing member and being turnably mounted on saidsupport means; a pair of cams forming part of said motion transmittingmeans, being respectively fixed to said bar and said arm and extendingtoward each other, each of said cams having a pair of camming faceswhich are inclined with respect to each other and the camming faces ofone cam successively engaging the camming faces of the other cam duringmovement of said tearing member in said predetermined direction to turnsaid bar and said roller therewith against the action of said springaway from said ratchet wheel and to then maintain said tearing member ina raised position distant from said platen.

11. In a business machine as defined in claim 3, said pressure structureincluding a pair of levers mounted on said support means for turningmovement about a common axis adjacent and parallel to said platen means,a pair of rollers respectively mounted turnably on said levers and beingrespectivly located on opposite sides of said common turning axis, and aspring connected at opposite ends to said levers for urging the same inopposite directions about said common axis and in those directions whichurge said rollers against said platen means; said motion transmittingmeans including a shaft parallel to said axis and turnably carried bysaid support means, a cam fixed to said shaft and located between saidlevers, said cam having a pair of opposite camming portions whichrespectively engage said levers during turning of said shaft tosimultaneously turnsaid levers and said rollers therewith away from saidplaten means, an arm turnably carried by said support means and fixed tosaid tearing member to carry the latter, a first link pivotallyconnected at one end to said arm, and a second link pivotally connectedto the opposite end of said first link and being fixed to said shaft sothat movement of said tear ing member in said predetermined direction istransmitted to said cam to turn the latter for simultaneously movingsaid levers away from said platen means.

12. In a business machine as defined in claim 5, said pressure structureincluding a pair of levers mounted on said support means for turningmovement about a common axis adjacent and parallel to said platen means,a pair of rollers respectively mounted turnably on said levers and beingrespectively located on opposite sides of said common turning axis, anda spring connected at opposite ends to said levers for urging the samein opposite directions about said common axis and in those directionswhich urge said rollers against said platen means; said manuallyoperable moving means including a shaft parallel to said axis andturnably carried by said support means, a cam fixed to said shaft andlocated between said levers, said cam having a pair of opposite cammingportions which respectively engage said levers during turning of saidshaft to simultaneously turn said levers and said rollers therewith awayfrom said platen means, and an arm, adapted to be actuated by theoperator, fixed to said shaft for turning the latter to turn said camfor moving said levers away from said platen means.

13. In a business machine as defined in claim 4, said platen meansincluding a platen and a ratchet wheel fixed thereto for turningmovement therewith, said locating structure including a bar turnablycarried by said support means, a roller turnably carried by said bar andlocated opposite the teeth of said ratchet wheel, and a spring connectedto said bar for urging said roller into engagement with said teeth; anarm carrying said tearing member and being turnably mounted on saidsupport means; and a cam forming part of said motion transmitting means,being fixed to said arm, and extending toward and located adjacent tosaid bar for engaging the latter during movement of said tearing memberin said predetermined direction to turn said bar and said rollertherewith against the action of said spring away from said ratchetwheel; said pressure structure including a pair of levers mounted onsaid support means for turning movement about a common axis adjacent andparallel to said platen means, said pressure rollers being respectivelymounted turnably on said levers and being respectively located onopposite sides of said common turning axis, and a spring connected atopposite ends to said levers for simultaneously urging the same inopposite directions toward said platen means; and said motiontransmitting means including a link pivotally connected at one end tosaid arm and at opposite end to only one of said levers for moving thelatter away from said platen means when said tearing member moves insaid predetermined direction.

14. In a business machine as defined in claim 5, said platen meansincluding a platen and a ratchet wheel fixed thereto for turningmovement therewith, said locating structure including a bar turnablycarried by said support means, a roller turnably carried by said bar andlocated opposite the teeth of said ratchet wheel, and a spring connectedto said bar for urging said roller into engagement with said teeth; anarm carrying said tearing member and being turnably mounted on saidsupport means; and a cam forming part of said motion transmitting means,being fixed to said arm, and extending toward and located adjacent tosaid bar for engaging the latter during movement of said tearing memberin said predetermined direction to turn said bar and said rollertherewith against the action of said spring away from said ratchetwheel; said pressure structure including a pair of levers mounted onsaid support means for turning movement about a common axis adjacent andparallel to said platen means, a pair of rollers respectively mountedturnably on said levers and being respectively located on opposite sidesof said common turning axis, and a spring connected at opposite ends tosaid levers for urging the same in opposite directions about said commonaxis and in those directions which urge said rollers against said platenmeans; said manually operable moving means including a shaft parallel tosaid axis and turnably carried by said support means, a cam fixed tosaid shaft and located between said levers, said cam having a pair ofopposite camming portions which respectively engage said levers duringturning of said shaft simultaneously said levers and said rollerstherewith away from said platen means, and an arm, adapted to beactuated by the operator, fixed to said shaft for turning the latter toturn said cam for moving said levers away from said platen means.

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